Antenna



FIG. 1 is a perspective view of an antenna showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view thereof being the same image thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view thereof being the same image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

Portions of FIGS. 1-5 that are shown as broken lines are for illustrative purpose only and form no part of the claimed design. 

The ornamental design for an antenna, as shown and described. 